I once read an introductory philosophy book that suggested philosophy is an activity something like this: make a list of everything that exists. Then discuss what goes on the list. Do numbers? Does God? Does the stock exchange? How about the sky — does the sky go on the list? Are people on the list or only gravity waves.
What does it mean — make a list of everything that exists? How would you do it? Why would you? Why would you think you could?
Could there be a person who believed in God, and then made the list, and noticed God was not on it, and then realized God did not exist?
What a strange thing to believe, that you could make such a list. I wonder why I ever believed it.